style: Rename alias to aliases in Longhand and Shorthand

Differential Revision: https://phabricator.services.mozilla.com/D105810

components/style/properties/shorthands/border.mako.rs

@@ -112,7 +112,7 @@ pub fn parse_border<'i, 't>(
             'border-%s-%s' % (side, prop)
             for prop in ['color', 'style', 'width']
         )}"
-        alias="${maybe_moz_logical_alias(engine, (side, logical), '-moz-border-%s')}"
+        aliases="${maybe_moz_logical_alias(engine, (side, logical), '-moz-border-%s')}"
         spec="${spec}">
 
     pub fn parse_value<'i, 't>(

components/style/properties/shorthands/position.mako.rs

@@ -115,7 +115,7 @@
 <%helpers:shorthand
     name="gap"
     engines="gecko"
-    alias="grid-gap"
+    aliases="grid-gap"
     sub_properties="row-gap column-gap"
     spec="https://drafts.csswg.org/css-align-3/#gap-shorthand"
 >